后掺骨料混凝土框架边节点恢复力模型研究

Exterior Joints Restoring Force Model of Scattering-filling Coarse Aggregate Concrete

基于后掺骨料混凝土框架边节点的拟静力试验结果,通过三折线模型和回归分析方法,得出骨架曲线计算模型中各段的数学表达式以及各特征点的数值,给出加载刚度和卸载刚度的计算公式。依据骨架曲线模型绘制各试件的计算骨架曲线,再按照滞回规则绘制各试件的计算滞回曲线。结果表明:计算曲线与试验曲线吻合良好,所建立的三折线恢复力模型可为后掺骨料混凝土框架节点的弹塑性地震反应分析提供参考。

Based on the quasi-static test results of the exterior joints of the scattering-filling coarse aggregate concrete,the tri-linear restoring force model and regression analysis method were used to obtain the mathematical expressions of each section and the numerical values of each characteristic point in the calculation model of skeleton curve,and the calculation formulas of loading and unloading stiffness were fitted.According to the skeleton curve model,the calculated skeleton curve of each specimen was drawn,and then according to the hysteresis rule,the calculated hysteresis curve of each specimen was drawn.The results show that the calculated curves are in good agreement with the test curves,and the established tri-linear restoring force model can provide a reference for the analysis of the elastoplastic seismic response of frame joints of the scattering-filling coarse aggregate concrete.